/
telemetry.go
68 lines (59 loc) · 1.68 KB
/
telemetry.go
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package telemetry
import (
"context"
"fmt"
"os"
"time"
"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc"
metricglobal "go.opentelemetry.io/otel/metric/global"
sdkmetric "go.opentelemetry.io/otel/sdk/metric"
sdkres "go.opentelemetry.io/otel/sdk/resource"
semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
)
const (
otlpAgentAddrEnv = "OTEL_EXPORTER_OTLP_ENDPOINT"
defaultOtlpAgentAddr = "0.0.0.0:4317"
)
// Init initializes telemetry providers
func Init(ctx context.Context, svcName string) (func() error, error) {
// Refer to https://opentelemetry.io/docs/instrumentation/go/getting-started/#creating-a-resource
res, err := sdkres.New(ctx,
sdkres.WithFromEnv(),
sdkres.WithProcess(),
sdkres.WithTelemetrySDK(),
sdkres.WithHost(),
sdkres.WithAttributes(semconv.ServiceNameKey.String(svcName)),
)
if err != nil {
return nil, fmt.Errorf("new resource: %w", err)
}
otelAgentAddr, ok := os.LookupEnv(otlpAgentAddrEnv)
if !ok {
otelAgentAddr = defaultOtlpAgentAddr
}
metricExporter, err := otlpmetricgrpc.New(ctx,
otlpmetricgrpc.WithInsecure(),
otlpmetricgrpc.WithEndpoint(otelAgentAddr),
)
if err != nil {
return nil, fmt.Errorf("new metric exporter: %w", err)
}
meterProvider := sdkmetric.NewMeterProvider(
sdkmetric.WithResource(res),
sdkmetric.WithReader(
sdkmetric.NewPeriodicReader(
metricExporter,
sdkmetric.WithInterval(2*time.Second),
),
),
)
metricglobal.SetMeterProvider(meterProvider)
return func() error {
ctx, cancel := context.WithTimeout(ctx, time.Second)
defer cancel()
if err := meterProvider.Shutdown(ctx); err != nil {
return fmt.Errorf("shutdown meter provider: %w", err)
}
return nil
}, nil
}